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Title: Control of waveguide properties by tuning femtosecond laser induced compositional changes

Local compositional changes induced by high repetition rate fs-laser irradiation can be used to produce high performance optical waveguides in phosphate-based glasses. The waveguide refractive index contrast is determined by the local concentration of La, which can be changed by the action of the writing laser pulses. In this work, we have investigated the degree of control that can be exerted using this waveguide writing mechanism over the cross-section of the guiding region, and the local refractive index and compositional changes induced. These variables can be smoothly controlled via processing parameters using the slit shaping technique with moderate Numerical Aperture (NA 0.68) writing optics. The combined use of X-ray microanalysis and near field refractive index profilometry evidences a neat linear correlation between local La content and refractive index increase over a broad Δn interval (>3 × 10{sup −2}). This result further confirms the feasibility of generating efficient, integrated optics elements via spatially selective modification of the glass composition.
Authors:
; ; ;  [1] ; ;  [2] ; ;  [3]
  1. Laser Processing Group, Instituto de Optica, CSIC, Serrano 121, 28006 Madrid (Spain)
  2. Instituto di Fotonica e Nanotecnologie, CNR, Piazza Leonardo da Vinci 32, 20133 Milano (Italy)
  3. Depto. de Física de Materiales, Facultad de Físicas, Univ. Complutense, 28040 Madrid (Spain)
Publication Date:
OSTI Identifier:
22350775
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; APERTURES; CONCENTRATION RATIO; CORRELATIONS; CROSS SECTIONS; GLASS; LANTHANUM COMPOUNDS; LASER RADIATION; MICROANALYSIS; MODIFICATIONS; OPTICS; PHOSPHATES; PULSES; REFRACTIVE INDEX; WAVEGUIDES; X RADIATION